NAME

rlm_acct_unique - FreeRADIUS Module

DESCRIPTION

The rlm_acct_unique module creates a unique accounting session Id.
Many NAS vendors have their equipment supply an Acct-Session-Id
attribute which is not unique over reboots. This makes accounting
difficult, as there will be many independent sessions with the same
Acct-Session-Id attribute. This module uses the Acct-Session-Id
attribute, along with other attributes in the request, to create a more
unique session ID, called Acct-Unique-Session-Id.
The main configuration items to be aware of are:
key A list of the attributes used in calculating an MD5 hash which
is used as the value for the unique session id.

CONFIGURATION

modules {
...
acct_unique {
key = "User-Name, Acct-Session-Id, NAS-IP-Address, NAS-Port"
}
...
}
...
preacct {
...
acct_unique
...
}
After generating the MD5 hash, the module adds it to the accounting
request packet received from the client. It will look something like
this in your detail file:
Acct-Unique-Session-Id = "c66ef57e480b9d26"
NOTE: Any attribute you specify that is not found in the 'dictionary'
file will cause the server to fail and exit with an error.
NOTE: If you want the Acct-Unique-Session-Id of the Start and the Stop
packet of a particular session to match, you must use values for the
key that will stay the same for the Start and Stop. The above example
is a good start. Adding 'Acct-Session-Time', for example, would cause
a mismatch because that value is not the same on the Start and Stop
accounting packets.